The Wow! signal - a 72-second radio burst from Sagittarius in 1977 that has never repeated | True Fr

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[00:00:00]In 1977, [music] a telescope heard something that's never spoken again. Space is freaky.

[00:00:06]Ohio State's Big Ear radio telescope was scanning the sky for alien signals.

[00:00:11]Most nights brought nothing but static and cosmic background noise. Then on August 15th, the machine recorded 72 seconds of something extraordinary.

[00:00:22]Astronomer Jerry Ehman spotted the anomaly days later in the data.

[00:00:27]He grabbed a red pen and scribbled one word in the margin.

[00:00:30]The signal was 30 times louder than background noise.

[00:00:34]Imagine your car radio suddenly blasting [music] a station that doesn't exist.

[00:00:39]It broadcast at 1420 MHz, the exact frequency [music] hydrogen atoms emit.

[00:00:45]SETI researchers call this the universe's most logical channel for contact.

[00:00:50]Every telescope on Earth has listened for a repeat.

[00:00:53]You could point a dish at that exact spot [music] in Sagittarius tonight and hear nothing.

[00:00:58]Comets, satellites, earthly interference, none of the explanations [music] quite fit.

[00:01:04]The signal came once, perfectly tuned, then vanished forever.

[00:01:08]Somewhere [music] in the constellation Sagittarius, something may have said hello.

[00:01:13]We're still listening. Now you know.